如果企业希望对外汇风险进行控制，他们可以从哪些方面努力？
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那些根、茎、叶含水极少，在丧失水分50%时仍不死亡的旱生植物属于（）
A. 多浆液植物
B. 少浆液植物
一个关于拳王阿里与弗雷泽比赛的故事，两人在最后都筋疲力尽，但阿里直到最后都保持了决不认输的气势，弗雷泽在最后关头无法坚持而认输，比赛一结束，阿里便也倒在了地上，弗雷泽这才知道阿里也同样没有力气了，他为自己放弃比赛而后悔。对这个故事请谈谈你的看法。
You are implementing a Windows Communication Foundation (WCF) client application that consumes the ICatalog and lCatalog2 service interfaces.You need to ensure that the client discovers services implementing these interfaces. The services may already be online or may come online within a 30 second time limit. How should you use WCF Discovery to accomplish this?（）
A. Create one FindCriteria object for each interface and set the Duration of each FindCriteria to 30 seconds. Call the FindAsync method of the DiscoveryClient class twice, one time for each of the FindCriteria objects, to search for the services.
B. Create one FindCriteria object for each interface and set the Duration of each FindCnteria to two seconds. Create a loop that calls the Find method of the DiscoveryClient class to search for the services. Within each loop iteration, call the Find method of the DiscoveryClient class once for each of the FindCriteria objects. Run the loop until a service is found or 30 seconds pass.
Create a single FindCriteria object and add both interfaces to its ContractTypeNames collection. Set the criteria's Duration to two seconds. Create a loop that calls the Find method of the DiscoveryClient class to search for the services. Within each loop iteration, call the Find method of the DiscoveryClient class to search for the services Run the loop until a service is found or 30 seconds pass.
D. Create a single FindCritera object and add both interfaces to the ContractTypeNames collection. Set the Duration to 30 seconds and use the FindAsync method of the DiscoveryClient class to search for the services.
公民甲想与妻子乙离婚，但乙不同意，甲决定杀害乙。在乙生日那天，甲将一包毒药拌在了乙最喜欢吃的菜里。不料乙的朋友丙来到他们家里为乙庆祝生日，并先吃了拌有毒药的菜，甲见丙吃那盘菜也很着急，但是怕事情败露而没有阻止丙，最后导致丙中毒死亡。甲的行为（）。
A. 构成故意杀人罪
B. 构成过失致人死亡罪
C. 构成投毒罪
D. 算比较严重的违法行为，但未构成犯罪
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